Question

The sum of the first 20 terms common between the series 3 + 6+
12 + .... and 1 + 5 + 9 +13 +.. is​

Answer 1

Answer:

621 and 685

Step-by-step explanation:

1. 3+6+12+15+18+21+24+27+30+33+36+39+42+45+48+51+54+57+60=621

(Gaps of 3)

2. 1+5+9+13+17+21+25+29+33+37+41+45+49+51+55+59+61+65+69=685

(Gaps of 4)