Question

The sum of first four 2digit number.

Answer 1

Answer:

46

Step-by-step explanation:

First four 2-digit number are 10, 11, 12, 13

The given series is an A.P.

first term (a) = 10

common difference (d) = 1

number of terms (n) = 4

Sum of n term = n/2 [2a+(n-1)d]

= 4/2 [ 20+(4-1)1]

= 2 [23]

= 46