Question

. Find the following sums [4]

1+2+3+..........+100

1+3+5+…...…..+99

2+4+6+………..+100

3+7+11+…..…..+199​

Answer 1

Answer:

1 ) 1 + 100 = 101

2 + 99 = 101

3 + 98 = 101

4 + 97 = 101

5 + 96 = 101

pair = 50

sum of pairs = 50 × 101 = 5050

MATE I KNOW ONLY FIRST ONE

Answer 2

(1).1+2+3+4+5+6+7+8+9+10+11+12+13+9

(2).1+3+5+7+9+11+13+15+18+17

(3).2+4+6+8+10+12+14+16+18+10

(4).3+7+11+15+19+23+27+31+35+28