Question

find two tringular numbers after 15 and show each of 6square and 7 square as the sum of two tringular numbers.plz give me correct answer ​

Answer 1

Answer:

15 and 21

21 and 28

Step-by-step explanation:

${6}^{2} = 36 = 15 + 21$

${7}^{2} = 49 = 21 + 28$

Also

$21 = 1 + 2 + 3 + 4 + 5 + 6$

$28 = 1 + 2 + 3 + 4 + 5 + 6 + 7$

Hence both 21 And 28 are triangular numbers

Answer 2

Answer:

I think this is correct answer