Question

Find the sum of 3 1/2 + 4 5/4 ​

Answer 1

Answer:

therefore answer is 8.3 or 8 3/10

Step-by-step explanation:

3½ = 7/2 and 4⅘=24/5

so 7/2+24/5

LCM = 10

7/2×5/5 = 35/10

24/5×2/2=48/10

35/10+48/10

= 83/10

= ans. 8.3 or 8 3/10

Answer 2

u = n(n+1)(n+3)

n+2

= n(n+1)(n+2)(n+3)(n+2) 2

= n(n+1)(n+2)(n+3)

n(n+1)+3n+4

= (n+2)(n+3)1

+ (n+1)(n+2)(n+3)3

+ n(n+1)(n+2)(n+3)4

.

Each of these expressions may now be taken as the n

th

term of a series to which the rule is applicable.

∴S n

=C− n+31

− 2(n+2)(n+3)3

−

3(n+1)(n+2)(n+3)4

;Put n=1, then

1.2.43

=C− 41

− 2.3.43

− 3.2.3.44

; hence C= 3629 ;

∴S n

= 3629

− n+31

− 2(n+2)(n+3)

3-3(n+1)(n+2)(n+3)4.