Question

P=1.3+2.4+3.5+...+97.99+98.100

Answer 1

1.2+2.4+3.5+...+98+100

= 1.( 2 + 1 ) + 2 . ( 3 + 1 ) + 3.( 4 + 1 ) + ... + 98 ( 99 + 1 )

= 1.2 + 1 + 2.3 + 2 + 3.4 + 3 +...+ 98.99 + 98

= ( 1.2 + 2.3 + 3.4 +...98.99 ) +(1+ 2 + 3 +...+ 98 )

= 323400 + 4851 = 328251.

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Answer 2

G = 1.3 + 2.4 + 3.5 +....+ 98.100 
= 1(2+1) + 2.(3+1) + 3.(4+1) +...+ 98(99+1)
= 1.2 + 1 + 2.3 + 2 + 3.4 + 3+....+ 98.99 +98
= (1.2 + 2.3 + 3.4+....98.99) + (1+2+3+....+98)
=323400 + 4851=328251

Answer 3

P = 1.3 + 2.4 + 3.5 +....+ 98.100 
= 1(2+1) + 2.(3+1) + 3.(4+1) +...+ 98(99+1)
= 1.2 + 1 + 2.3 + 2 + 3.4 + 3+....+ 98.99 +98
= (1.2 + 2.3 + 3.4+....98.99) + (1+2+3+....+98)
=323400 + 4851=328251