Question

4+5+6+________+108=?​

Answer 1

Answer:

a=4

d=5-4=1

an = 108

an =a+(n-1)d

108 = 4+(n-1)1

108-4=(n-1)1

104/1=(n-1)

(n-1)=104

n =104+1

n=105

NOW

Sn =n/2 {2a+(n-1)d}

S105 =105/{2*4+(105-1)1

S105={8+104}

S105=105/2*112

S105=105*56

S105=5880

Answer 2

4 + 5+ 6+ 7+ 8+ 9+ 10+...........+100+101+102+103+104+105106+108 =5880