Question

1,3,6,10,15,............... എന്ന സംഖ്യാശ്രേണിയുടെ പത്താമത്തെ പദം ഏതാണ് ?.

• A. 45
• B. 150
• C. 55
• D. 110

Answer 1

Answer:

C. 55

The given sequence appears to be a sequence of triangular numbers:

1 = 1
3 = 1 + 2
6 = 1 + 2 + 3
10 = 1 + 2 + 3 + 4
15 = 1 + 2 + 3 + 4 + 5

To find the tenth term, we can use the formula for the nth triangular number:

Tn = n(n+1)/2

For the 10th term:

T10 = 10(10+1)/2
= 10(11)/2
= 55

So, the tenth term of the sequence is:

55