IW7 · 2026-10-21

IW7: Two Different Pairs Reached the Same Target

Use four number cards to test whether a solution is unique. A valid pair answers “can it be done”, but does not settle “is this the only way”.

Between card demonstrations, the host sets out four paper cards numbered 1, 2, 3 and 4. The warm-up asks for two different cards totalling five. Ravi chooses 1 and 4, then covers the other cards because he believes the task is finished in every possible sense.

Want app links and current offer details? Choose your community below.
TG ChannelWhatsApp ChannelWhatsApp Group

One answer, two questions

His pair meets the instruction. To establish that it is the only answer, however, he must inspect the alternatives. The pair 2 and 3 also totals five. Both use two distinct available cards, so neither needs an exception or a duplicated card.

The group writes the pairs as 1+4 and 2+3. Writing 4+1 does not create a third unordered pair. If a later activity assigns different roles to the first and second cards, order could matter, but that is not part of this warm-up.

Keep up with shared activities and app updates through your preferred channel.
TG ChannelWhatsApp ChannelWhatsApp Group

Check the wording before adding restrictions

Nothing says to use the smallest number, choose neighbouring ranks or leave the largest card unused. Ravi had silently added “start with one” because it was the first card he saw. The host asks him to distinguish a convenient search order from a condition in the question.

They finish by changing the target and searching again with the same four cards. The useful habit is to say exactly what has been shown: one valid construction, several constructions, or an exhaustive check. This keeps a successful first idea from being mistaken for proof that every other idea must fail.

Ready to explore? Open a channel for app information and the terms of shared offers.
TG ChannelWhatsApp ChannelWhatsApp Group