Question

Find the following sums

a) 1+2+3+............+10

b) 3+9+12+..........+30​

Answer 1

a) 55

b) 159

Step-by-step explanation:

a) 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55

b) 3 + 9 + 12 + 15 + 18 + 21 + 24 + 27 + 30 = 159

Hope it helps you..........