Question

Find the sum of AP 2,7,12_____, to 10 terms.​

Answer 1

Answer:

Sum of AP = n x $\frac{2a + (n-1)d}{2}$

where, n = Number of terms = 10

a = First term = 2

d = Common difference = 7-2 = 5

Sum = 10 x { $\frac{2 X 2 + (10 - 1)5}{2}$}

       = 10 x {$\frac{4 + 45}{2}$}

       = 10 X $\frac{49}{2}$

       = 49 X 5 = 245

Answer 2

Answer:

2+7+12+17+22+27+32+37+42+47=245