Question

20.The decimal expansion of the rational number 74/〖2^3.5〗^4 will terminate after Places

21.Write whether (2√45+3√20)/(2√5) on simplification give a rational or an irrational number.

22. Find the zeroes of the polynomial and verify the relationship between the zeroes and the coefficient

a) 4x2 + 1 – 4x b) x2 – 3 c) 4x2 – 7 d) √3x2 – 8x + 4√3

23.Find the polynomial, whose zeroes are 2 + √3 and 2 - √3

24.Form a quadratic polynomial, one of whose zero is 2 + √5 and the sum of zeroes is 4

25.Find a quadratic polynomial whose sum and product of the zeroes are 21/8 and 5/16​

Answer 1

Answer:

(ii) E: at least two heads F : at most two heads

(iii) E: at most two tails F: at least one tail

Solution:

NCERT Solutions Class 12 Maths Chapter 13 Probability Ex 13.1 Q 6

Ex 13.1 Class 12 Maths Question 7.

Two coins are tossed once

(i) E: tail appears on one coin F: one coin shows head

(ii) E: no tail appears F: no head appears.

Solution:

NCERT Solutions Class 12 Maths Chapter 13 Probability Ex 13.1 Q 7

Ex 13.1 Class 12 Maths Question 8.

A die is thrown three times.

E: 4 appears on the third toss

F: 6 and 5 appears respectively on first two tosses.

Solution:

Class 12 Maths NCERT Solutions Chapter 13 Probability Ex 13.1 Q 8

Ex 13.1 Class 12 Maths Question 9.

Mother, father and son line up at random for a family picture:

E: son on one end, F: father in middle

Solution:

Class 12 Maths NCERT Solutions Chapter 13 Probability Ex 13.1 Q 9

Ex 13.1 Class